US10245867B2 - Thermal imaging - Google Patents
Thermal imaging Download PDFInfo
- Publication number
- US10245867B2 US10245867B2 US13/921,130 US201313921130A US10245867B2 US 10245867 B2 US10245867 B2 US 10245867B2 US 201313921130 A US201313921130 A US 201313921130A US 10245867 B2 US10245867 B2 US 10245867B2
- Authority
- US
- United States
- Prior art keywords
- recording medium
- thermosensitive recording
- dye precursor
- alkyl
- oxidizing agent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
- B41M5/323—Organic colour formers, e.g. leuco dyes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
- B41M5/333—Colour developing components therefor, e.g. acidic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
- B41M5/30—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using chemical colour formers
- B41M5/337—Additives; Binders
- B41M5/3372—Macromolecular compounds
Definitions
- the present application for patent is in the field of graphic imaging technologies, specifically is in the field of thermal imaging.
- Thermal printing systems use a thermal print element energized to heat specific and precise areas of a heat sensitive paper to provide an image of readable characters or graphics on the heat sensitive paper.
- the heat sensitive paper also known as thermal paper, includes material(s) which are reactive to applied heat.
- the thermal paper is a self-contained system, referred to as direct thermal, because ink need not be applied.
- Thermal printing systems are ubiquitous and typically include point of sale (POS) devices, facsimile machines, adding machines, automated teller machines (ATMs), credit card machines, gas pump machines, electronic blackboards, and the like.
- POS point of sale
- ATMs automated teller machines
- credit card machines credit card machines
- gas pump machines electronic blackboards, and the like.
- Typical chemistries used in thermal papers are based on (a) silver salts combined with reducing agents that are activated by heat, and (b) dye-developing type systems that comprise a colorless dye (color former), a bisphenol such as bisphenol-a (color developer) and a sensitizer. These solid materials are reduced to very small particles by grinding and incorporated into a coating formulation along with any optional additives such as pigments, binders and lubricants.
- the coating formulation is then applied to the surface of a support system, typically a base sheet and base coating. The color is formed by application of heat to the thermosensitive coating to melt together and thereby cause a darkening reaction.
- the conjunction “and” is intended to be inclusive and the conjunction “or” is not intended to be exclusive unless otherwise indicated.
- the phrase “or, alternatively” is intended to be exclusive.
- the conjunction “or” is intended to be exclusive.
- thermosensitive recording medium having a base sheet; a binder; and a thermosensitive material on at least one surface of the base sheet comprising: one or more oxidizing agents; and a dye precursor having the formula;
- R 1 and R 2 can be the same or different and are: H, alkyl or 1-4 C, NH 2 , OH, COOR′ wherein R′ is alkyl of 1-4C or H, CONH 2 , halogen, OR′′ wherein R′′ is alkyl of 1-4C, CH 2 OH, CH 2 NH 2 , CONR′R′′ wherein R′ and R′′ can be the same or different; R 3 is H or alkyl of 1-4C or COR′′; R 4 , R 5 can be the same or different and are: H, alkyl of 1-4C, NH 2 , OH, COOH, CONH 2 , halogen, OR′′, NO 2 , SO 3 , HNR′′, or NR′′R′′ or any pharmaceutically acceptable salts thereof or mixtures thereof and wherein R 6 and R 7 can be the same or different and can be hydrogen, a carboxylate group, a borate group or a silicate group.
- Exemplary materials used as dye precursors include L-Dopa
- a base sheet may comprise paper, coated paper, a film, a plastic material such as Mylar, a composite material such as aluminized Mylar®, layered polymer materials, filled polymer materials or the like, a solid material such as a phenolic-based printed circuit board, silica glass or the like, or a metal material such as metal foil.
- the base sheet may be treated with materials that promote adhesion, improve the durability of the final recording medium or impart a desired finish to the recording medium.
- binders can comprise a resin or resins chosen from polystyrene, polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylamide, polymethacrylamide, polyacrylic acid, polymethacrylic acid, polyethylene glycol, proteinaceous binders such as gelatin. modified gelatines such as phthaloyl gelatine, polysaccharides, such as starch, gum arabic and dextran, water-soluble cellulose, resin having an ether bond, resin having a carbamoyl group, resin having a carboxyl group, and derivatives or combinations thereof. Binders can be applied in water soluble and water dispersible formulations, wherein volatile organic solvents are kept below 5% w/w of the total formulation. In addition, when required, binders can be applied from non aqueous solvents.
- oxidizing agents can be salts whose anion is chosen from periodate, persulfate, perborate, iodate, peroxydisulfate, monopersulfate, or hypochlorite.
- other oxidizing agents can be used. These include (2,2,6,6-tetramethylpiperidin-1-yl)oxyl (TEMPO), ferric chloride, peroxides such as, for example, hydrogen peroxide, tert-butyl hydroperoxide, benzoyl peroxide, other organic based peroxides and cerium (IV) ammonium nitrate.
- TEMPO (2,2,6,6-tetramethylpiperidin-1-yl)oxyl
- ferric chloride peroxides such as, for example, hydrogen peroxide, tert-butyl hydroperoxide, benzoyl peroxide, other organic based peroxides and cerium (IV) ammonium nitrate.
- any counter cation can be used as constituents
- oxidizing agents includes “functional metal salts” which are any metal ion which accelerates the formation of dye from the dye precursor described above. Salts of any of a variety of metals may be employed for this purpose.
- the metallic salts that may be used in accordance with the present composition, medium and process include the transition metals, for example, copper (e.g. Cu+2), titanium (e.g. Ti+2), zinc (e.g. Zn+2), iron (e.g. Fe+2 and Fe+3) nickel (e.g., Ni+2), cobalt (e.g. Co+2), lead (e.g. Pb+2), silver (e.g. Ag+1) and manganese (e.g. Mn+2).
- copper e.g. Cu+2
- titanium e.g. Ti+2
- zinc e.g. Zn+2
- iron e.g. Fe+2 and Fe+3
- nickel e.g., Ni+2
- cobalt e.g. Co+2
- media and processes include, for example, CuSO 4 , Ti(lactate) 4 , Fe(NO 2 ) 3 , Fe(NO 3 ) 3 , FeSO 4 , FeCl 3 , K 3 Fe(CN) 6 , Pb(acetate) 2 , Cu(II) (citrate), ZnSO 4 , NiSO 4 , Co(acetate) 2 , AgNO 3 , Mn(NO 3 ) 2 , MnCl 2 , and the like.
- compositions may contain one or more oxidizing agents and may be chosen from more than one chemical family.
- salts with pharmaceutically acceptable acids or bases.
- Pharmaceutically acceptable salts are well known in the art. For example, S. M. Berge, et al. describes pharmaceutically acceptable salts in detail in J. Pharmaceutical Sciences, 66: 1-19 (1977).
- the salts can be prepared in situ during the final isolation and purification of the catechol-based precursor, or separately by reacting the free base function with a suitable organic acid.
- salts include, but are not limited to, nontoxic acid addition salts are salts of an amino group formed with inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid or with organic acids such as acetic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by using other methods used in the art such as ion exchange.
- inorganic acids such as hydrochloric acid, hydrobromic acid, phosphoric acid, sulfuric acid or with organic acids such as acetic acid, maleic acid, tartaric acid, citric acid, succinic acid or malonic acid or by using other methods used in the art such as ion exchange.
- salts include, but are not limited to, adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, citrate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate, pamo
- Pharmaceutically acceptable salts of carboxylates and other oxo-acids can be formed with cationic species such as alkali or alkaline earth metal ions including sodium, lithium, potassium, calcium, magnesium, and the like.
- pharmaceutically acceptable salts include, when appropriate, nontoxic ammonium, quaternary ammonium, and amine cations as well as natural product cations such as choline and acetyl choline and the like.
- Anionic counterions include halides, hydroxide, carboxylate, sulfate, phosphate, nitrate, alkyl (having from 1 to 6 carbon atoms) sulfonate and aryl sulfonate.
- thermosensitive recording medium may contain basic materials.
- basic materials may be useful in catalyzing the change in optical density of the recording medium when heat is applied.
- Such basic materials include ammonia and organic amines such as alkyl amines, and aryl amines, as well as salts of organic and inorganic acids.
- These salts may have anions that include adipate, alginate, ascorbate, aspartate, benzenesulfonate, benzoate, bicarbonate, bisulfate, borate, butyrate, camphorate, camphorsulfonate, carbonate, citrate, cyclopentanepropionate, digluconate, dodecylsulfate, ethanesulfonate, formate, fumarate, glucoheptonate, glycerophosphate, gluconate, hemisulfate, heptanoate, hexanoate, hydroiodide, 2-hydroxy-ethanesulfonate, lactobionate, lactate, laurate, lauryl sulfate, malate, maleate, malonate, methanesulfonate, 2-naphthalenesulfonate, nicotinate, nitrate, oleate, oxalate, palmitate,
- ammonia and organic amines are either toxic or can have undesirable side-effects such as skin irritation, burning, redness, itchy skin, swelling, or breathing trouble.
- bases other than ammonia and organic amines whether primary, secondary, tertiary or pyridinic.
- thermosensitive imaging medium In order to control the darkening reaction so that it does not occur prematurely, it may be desirable to sequester some of the chemical constituents of the thermosensitive imaging medium.
- sodium bicarbonate may be sequestered by encapsulation or microencapsulation.
- Microencapsulated sodium bicarbonate is commercially available from Encapsulation Systems Corporation under the trade names OST-9362-01 and OST-9362-02.
- microencapsulated sodium bicarbonate is available from Balchem corporation under the trade names Bakesure 184 and Bakesure 185.
- the chemical constituents, including bases, oxidizing agents and the dye precursor may be uncoated or may be coated with materials suitable to sequester them by known techniques, including microencapsulation to delay the darkening reaction.
- a material such as glyceryl monostearate or glyceryl distearate alone or with a wax may be employed as a material suitable for producing an encapsulated, microencapsulated or otherwise sequestered material.
- an oligomer/polymer of hydroxyacetic acid and lactic acid or a oligomer/polymer of lactic acid and glycolic acid are suitable for use as an encapsulant material for sequestration and can be used in conjunction with nonionic, cationic, anionic and zwitterionic surfactants from a melt or from admixture to produce the encapsulated chemical constituents.
- Encapsulated and microencapsulated chemical constituents can be prepared by techniques known in the art; which techniques include pan coating, air suspension coating, centrifugal extrusion, core-shell encapsulation using a vibrational nozzle, spray drying, ionotropic gelation, coacervation, interfacial polycondensation, interfacial crosslinking, in-situ polymerization or matrix polymerization.
- the dye precursors can be the unsubstituted catechol compounds or they can have one or both of their phenolic hydroxy groups esterified to form esters which may or may not be pharmaceutically acceptable.
- the term “dye precursor” is intended to mean either or both of the esterified or unesterified compound or compounds and esters may be formed with organic or inorganic acids.
- boric acid-catechol esters may form with the dye precursor in the presence of boric acid or its salts to form products such as, for example, the following:
- R 1 , R 2 , R 3 , R 4 and R 5 are as given above and the product species in II is an anion, as indicated. It should be understood that the structure given above is only one diastereomer and that the other is also possible. It is known in the art that oxidation of catechol compounds by oxidation agents can be inhibited by esterification in this manner. For example, inhibition of the oxidation of catechol by tyrosinase was shown by Yasunobu et al., J. Biol. Chem., 227, 473, (1957).
- esters of silicates and other inorganic and organic acid anions may also be formed and inhibit oxidation until heat is applied.
- ester include, for example, those derived from pharmaceutically acceptable aliphatic carboxylic acids, particularly alkanoic, alkenoic, cycloalkanoic and alkanedioic acids, in which each alkyl or alkenyl moiety has not more than 6 carbon atoms.
- esters include, but are not limited to, formates, acetates, propionates, butyrates, acrylates and ethylsuccinates.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Heat Sensitive Colour Forming Recording (AREA)
Abstract
Description
wherein R1 and R2 can be the same or different and are: H, alkyl or 1-4 C, NH2, OH, COOR′ wherein R′ is alkyl of 1-4C or H, CONH2, halogen, OR″ wherein R″ is alkyl of 1-4C, CH2 OH, CH2NH2, CONR′R″ wherein R′ and R″ can be the same or different; R3 is H or alkyl of 1-4C or COR″; R4, R5 can be the same or different and are: H, alkyl of 1-4C, NH2, OH, COOH, CONH2, halogen, OR″, NO2, SO3, HNR″, or NR″R″ or any pharmaceutically acceptable salts thereof or mixtures thereof and wherein R6 and R7 can be the same or different and can be hydrogen, a carboxylate group, a borate group or a silicate group. Exemplary materials used as dye precursors include L-Dopa, R-Dopa, salts thereof, including pharmaceutically suitable salts thereof, and esters thereof, including pharmaceutically suitable esters thereof.
Where R1, R2, R3, R4 and R5 are as given above and the product species in II is an anion, as indicated. It should be understood that the structure given above is only one diastereomer and that the other is also possible. It is known in the art that oxidation of catechol compounds by oxidation agents can be inhibited by esterification in this manner. For example, inhibition of the oxidation of catechol by tyrosinase was shown by Yasunobu et al., J. Biol. Chem., 227, 473, (1957).
Claims (17)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/921,130 US10245867B2 (en) | 2013-06-18 | 2013-06-18 | Thermal imaging |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/921,130 US10245867B2 (en) | 2013-06-18 | 2013-06-18 | Thermal imaging |
Publications (2)
Publication Number | Publication Date |
---|---|
US20140371064A1 US20140371064A1 (en) | 2014-12-18 |
US10245867B2 true US10245867B2 (en) | 2019-04-02 |
Family
ID=52019714
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/921,130 Active US10245867B2 (en) | 2013-06-18 | 2013-06-18 | Thermal imaging |
Country Status (1)
Country | Link |
---|---|
US (1) | US10245867B2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4808565A (en) * | 1986-08-14 | 1989-02-28 | Minnesota Mining And Manufacturing Company | Thermal imaging material |
US4985392A (en) * | 1989-04-21 | 1991-01-15 | Minnesota Mining And Manufacturing Company | Colored thermographic media |
-
2013
- 2013-06-18 US US13/921,130 patent/US10245867B2/en active Active
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4808565A (en) * | 1986-08-14 | 1989-02-28 | Minnesota Mining And Manufacturing Company | Thermal imaging material |
US4985392A (en) * | 1989-04-21 | 1991-01-15 | Minnesota Mining And Manufacturing Company | Colored thermographic media |
Also Published As
Publication number | Publication date |
---|---|
US20140371064A1 (en) | 2014-12-18 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3633669B2 (en) | Inkjet printing method | |
JP2008545560A (en) | Laser imaging method using malonate or aldonate | |
JPS6253879A (en) | Thermal recording material | |
US10245867B2 (en) | Thermal imaging | |
US4043820A (en) | Ink containing iron chelate and polyhydroxy compound | |
EP1331104A2 (en) | Heat sensitive recording material and recording method | |
JP4076676B2 (en) | Thermal recording material and method for producing the same | |
JPS643676B2 (en) | ||
JPS5911286A (en) | Pressure-sensing or thermo-sensitive recording material | |
JPH08230324A (en) | Thermal recording material | |
JP3990071B2 (en) | Thermal recording material | |
JP4789173B2 (en) | Microcapsule production method, microcapsule produced by this production method, recording paper on which information is recorded with this microcapsule, and recording liquid containing this microcapsule | |
JPS60225791A (en) | Thermal color forming composition and thermal recording material comprising the same | |
EP2325018A1 (en) | Thermally sensitive recording material | |
JPS6018302B2 (en) | Carbonless copy paper | |
JPH01115682A (en) | Thermal recording material | |
JPH09506304A (en) | Thermographic recording film containing an improved washcoat. | |
JPH0259788B2 (en) | ||
JPH0152196B2 (en) | ||
JP2006130931A (en) | Manufacturing method for heat-sensitive recording material | |
JPS63115786A (en) | Thermal recording material | |
JPS62198494A (en) | Color forming recording material | |
JP2005161524A (en) | Image recording material | |
JPH0615963A (en) | Heat-sensitive recording material | |
JP2004299354A (en) | Thermal recording material and thermal recording method |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCF | Information on status: patent grant |
Free format text: PATENTED CASE |
|
AS | Assignment |
Owner name: BABCOCK, JAMES V., CALIFORNIA Free format text: SECURITY INTEREST;ASSIGNOR:WARNER BABCOCK INSTITUTE FOR GREEN CHEMISTRY, LLC;REEL/FRAME:055732/0403 Effective date: 20200326 Owner name: CTHULHU VENTURES LLC, CALIFORNIA Free format text: SECURITY INTEREST;ASSIGNOR:WARNER BABCOCK INSTITUTE FOR GREEN CHEMISTRY, LLC;REEL/FRAME:055732/0383 Effective date: 20200326 |
|
AS | Assignment |
Owner name: WARNER BABCOCK INSTITUTE FOR GREEN CHEMISTRY, LLC, MASSACHUSETTS Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:CTHULHU VENTURES LLC;REEL/FRAME:059670/0045 Effective date: 20220421 Owner name: WARNER BABCOCK INSTITUTE FOR GREEN CHEMISTRY, LLC, MASSACHUSETTS Free format text: RELEASE BY SECURED PARTY;ASSIGNOR:BABCOCK, JAMES V.;REEL/FRAME:059672/0048 Effective date: 20220421 |
|
MAFP | Maintenance fee payment |
Free format text: PAYMENT OF MAINTENANCE FEE, 4TH YR, SMALL ENTITY (ORIGINAL EVENT CODE: M2551); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY Year of fee payment: 4 |